Chapter 1 General System Description
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2.3.2
Power Management State Transition
Full-On (S0)
Power/Suspend button
Lid switch
Idle (S0)
resume
Power/Suspend button
Lid switch
Suspend (S3)
resume
Power/Suspend button
Lid switch
SOFF/STD (S4/S5)
resume
2.3.3
Power Management Mode Definitions
Each system (or model) may have different PM model and state definition. For clear, see the following table:
PM Mode
Definitions
Full-On
The CPU run in full speed and all the devices are power on. The system can respond to all
applications with maximum performance.
1.
The system in the state S0.
2.
The CPU in the state C0.
3.
All the devices in the state D0.
Idle
This mode is similar to Full-On except the CPU will change to C1 or C2 state depend on the OS, to
save CPU power consumption.
1.
The system in the state S0.
2.
The CPU in the state C1 or C2.
CPU in full speed (C0)
All Devices are working
CPU STPCLK (C2)
All Devices are working
CPU STPCLK (C2)
All Devices are in low power
state
CPU power off
All Devices except RTC are
power off
